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<li class="navelem"><a class="el" href="dir_8d855866ba5d436d839c7fc557836cd9.html">libavutil</a></li> </ul>
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<a href="crc_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at></span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * This file is part of FFmpeg.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * License as published by the Free Software Foundation; either</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#ifndef AVUTIL_CRC_H</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_CRC_H</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <stdint.h></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <stddef.h></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include "<a class="code" href="attributes_8h.html">attributes.h</a>"</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include "<a class="code" href="libavutil_2version_8h.html">version.h</a>"</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * @defgroup lavu_crc32 CRC32</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * @ingroup lavu_crypto</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f"> 35</a></span> <span class="keyword">typedef</span> uint32_t <a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a>;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#gab7717a9f1179a5ac8516982f9f2997d2"> 37</a></span> <span class="keyword">typedef</span> <span class="keyword">enum</span> {</div>
<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a892e48b7e846baeefd1b55a955f5cc66"> 38</a></span>  <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a892e48b7e846baeefd1b55a955f5cc66">AV_CRC_8_ATM</a>,</div>
<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ae71c422e08cb83214c438ec352799e75"> 39</a></span>  <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ae71c422e08cb83214c438ec352799e75">AV_CRC_16_ANSI</a>,</div>
<div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a0e915db19602a96b5a83a953fd169a95"> 40</a></span>  <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a0e915db19602a96b5a83a953fd169a95">AV_CRC_16_CCITT</a>,</div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a2c95e44f51d497669d7c49d58018dea1"> 41</a></span>  <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a2c95e44f51d497669d7c49d58018dea1">AV_CRC_32_IEEE</a>,</div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aa43f268d15303373c90287522a4d4752"> 42</a></span>  <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aa43f268d15303373c90287522a4d4752">AV_CRC_32_IEEE_LE</a>, <span class="comment">/*< reversed bitorder version of AV_CRC_32_IEEE */</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aee02f172ec3ff10972855bdab591927a"> 43</a></span>  <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aee02f172ec3ff10972855bdab591927a">AV_CRC_16_ANSI_LE</a>, <span class="comment">/*< reversed bitorder version of AV_CRC_16_ANSI */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#if FF_API_CRC_BIG_TABLE</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor"></span> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a317de029f3dce59427fe4681c5a8af2a">AV_CRC_24_IEEE</a> = 12,</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a317de029f3dce59427fe4681c5a8af2a"> 47</a></span> <span class="preprocessor"></span> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a317de029f3dce59427fe4681c5a8af2a">AV_CRC_24_IEEE</a>,</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#endif </span><span class="comment">/* FF_API_CRC_BIG_TABLE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ac72372c57b632a072de910c789ad08ee"> 49</a></span> <span class="preprocessor"></span> <a class="code" href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ac72372c57b632a072de910c789ad08ee">AV_CRC_MAX</a>, <span class="comment">/*< Not part of public API! Do not use outside libavutil. */</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> }<a class="code" href="group__lavu__crc32.html#gab7717a9f1179a5ac8516982f9f2997d2">AVCRCId</a>;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"></span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * Initialize a CRC table.</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> * @param ctx must be an array of size sizeof(AVCRC)*257 or sizeof(AVCRC)*1024</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> * @param le If 1, the lowest bit represents the coefficient for the highest</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * exponent of the corresponding polynomial (both for poly and</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * actual CRC).</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * If 0, you must swap the CRC parameter and the result of av_crc</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * if you need the standard representation (can be simplified in</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * most cases to e.g. bswap16):</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * av_bswap32(crc << (32-bits))</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * @param bits number of bits for the CRC</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * @param poly generator polynomial without the x**bits coefficient, in the</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> * representation as specified by le</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * @param ctx_size size of ctx in bytes</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * @return <0 on failure</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keywordtype">int</span> <a class="code" href="group__lavu__crc32.html#ga27f906ac7e618afdac0be18de678ac3d">av_crc_init</a>(<a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a> *ctx, <span class="keywordtype">int</span> le, <span class="keywordtype">int</span> bits, uint32_t poly, <span class="keywordtype">int</span> ctx_size);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"></span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * Get an initialized standard CRC table.</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * @param crc_id ID of a standard CRC</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> * @return a pointer to the CRC table or NULL on failure</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="keyword">const</span> <a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a> *<a class="code" href="group__lavu__crc32.html#gabb35ea72fdeee2645e4e57cae225ac2b">av_crc_get_table</a>(<a class="code" href="group__lavu__crc32.html#gab7717a9f1179a5ac8516982f9f2997d2">AVCRCId</a> crc_id);</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"></span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * Calculate the CRC of a block.</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> * @param crc CRC of previous blocks if any or initial value for CRC</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * @return CRC updated with the data from the given block</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * @see av_crc_init() "le" parameter</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> uint32_t <a class="code" href="group__lavu__crc32.html#gae0feb73f66306494315f07de7ab57f80">av_crc</a>(<span class="keyword">const</span> <a class="code" href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a> *ctx, uint32_t crc,</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">const</span> uint8_t *buffer, <span class="keywordtype">size_t</span> length) <a class="code" href="attributes_8h.html#adc7fd5bb40d84900a3a30ef3318020c2">av_pure</a>;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"></span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_CRC_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="attributes_8h_html_adc7fd5bb40d84900a3a30ef3318020c2"><div class="ttname"><a href="attributes_8h.html#adc7fd5bb40d84900a3a30ef3318020c2">av_pure</a></div><div class="ttdeci">#define av_pure</div><div class="ttdef"><b>Definition:</b> <a href="attributes_8h_source.html#l00070">attributes.h:70</a></div></div>
<div class="ttc" id="group__lavu__crc32_html_ggab7717a9f1179a5ac8516982f9f2997d2aee02f172ec3ff10972855bdab591927a"><div class="ttname"><a href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aee02f172ec3ff10972855bdab591927a">AV_CRC_16_ANSI_LE</a></div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00043">crc.h:43</a></div></div>
<div class="ttc" id="attributes_8h_html"><div class="ttname"><a href="attributes_8h.html">attributes.h</a></div><div class="ttdoc">Macro definitions for various function/variable attributes. </div></div>
<div class="ttc" id="group__lavu__crc32_html_ggab7717a9f1179a5ac8516982f9f2997d2a317de029f3dce59427fe4681c5a8af2a"><div class="ttname"><a href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a317de029f3dce59427fe4681c5a8af2a">AV_CRC_24_IEEE</a></div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00047">crc.h:47</a></div></div>
<div class="ttc" id="group__lavu__crc32_html_ggab7717a9f1179a5ac8516982f9f2997d2aa43f268d15303373c90287522a4d4752"><div class="ttname"><a href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2aa43f268d15303373c90287522a4d4752">AV_CRC_32_IEEE_LE</a></div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00042">crc.h:42</a></div></div>
<div class="ttc" id="group__lavu__crc32_html_ga27f906ac7e618afdac0be18de678ac3d"><div class="ttname"><a href="group__lavu__crc32.html#ga27f906ac7e618afdac0be18de678ac3d">av_crc_init</a></div><div class="ttdeci">int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)</div><div class="ttdoc">Initialize a CRC table. </div></div>
<div class="ttc" id="group__lavu__crc32_html_gab7717a9f1179a5ac8516982f9f2997d2"><div class="ttname"><a href="group__lavu__crc32.html#gab7717a9f1179a5ac8516982f9f2997d2">AVCRCId</a></div><div class="ttdeci">AVCRCId</div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00037">crc.h:37</a></div></div>
<div class="ttc" id="group__lavu__crc32_html_ggab7717a9f1179a5ac8516982f9f2997d2a0e915db19602a96b5a83a953fd169a95"><div class="ttname"><a href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a0e915db19602a96b5a83a953fd169a95">AV_CRC_16_CCITT</a></div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00040">crc.h:40</a></div></div>
<div class="ttc" id="group__lavu__crc32_html_ggab7717a9f1179a5ac8516982f9f2997d2a2c95e44f51d497669d7c49d58018dea1"><div class="ttname"><a href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a2c95e44f51d497669d7c49d58018dea1">AV_CRC_32_IEEE</a></div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00041">crc.h:41</a></div></div>
<div class="ttc" id="libavutil_2version_8h_html"><div class="ttname"><a href="libavutil_2version_8h.html">version.h</a></div><div class="ttdoc">Libavutil version macros. </div></div>
<div class="ttc" id="group__lavu__crc32_html_gae0feb73f66306494315f07de7ab57f80"><div class="ttname"><a href="group__lavu__crc32.html#gae0feb73f66306494315f07de7ab57f80">av_crc</a></div><div class="ttdeci">uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length) av_pure</div><div class="ttdoc">Calculate the CRC of a block. </div></div>
<div class="ttc" id="group__lavu__crc32_html_gabb35ea72fdeee2645e4e57cae225ac2b"><div class="ttname"><a href="group__lavu__crc32.html#gabb35ea72fdeee2645e4e57cae225ac2b">av_crc_get_table</a></div><div class="ttdeci">const AVCRC * av_crc_get_table(AVCRCId crc_id)</div><div class="ttdoc">Get an initialized standard CRC table. </div></div>
<div class="ttc" id="group__lavu__crc32_html_ggab7717a9f1179a5ac8516982f9f2997d2a892e48b7e846baeefd1b55a955f5cc66"><div class="ttname"><a href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2a892e48b7e846baeefd1b55a955f5cc66">AV_CRC_8_ATM</a></div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00038">crc.h:38</a></div></div>
<div class="ttc" id="group__lavu__crc32_html_ggab7717a9f1179a5ac8516982f9f2997d2ac72372c57b632a072de910c789ad08ee"><div class="ttname"><a href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ac72372c57b632a072de910c789ad08ee">AV_CRC_MAX</a></div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00049">crc.h:49</a></div></div>
<div class="ttc" id="group__lavu__crc32_html_ggab7717a9f1179a5ac8516982f9f2997d2ae71c422e08cb83214c438ec352799e75"><div class="ttname"><a href="group__lavu__crc32.html#ggab7717a9f1179a5ac8516982f9f2997d2ae71c422e08cb83214c438ec352799e75">AV_CRC_16_ANSI</a></div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00039">crc.h:39</a></div></div>
<div class="ttc" id="group__lavu__crc32_html_gad7b1134679f68f2d4a52edaf1441e38f"><div class="ttname"><a href="group__lavu__crc32.html#gad7b1134679f68f2d4a52edaf1441e38f">AVCRC</a></div><div class="ttdeci">uint32_t AVCRC</div><div class="ttdef"><b>Definition:</b> <a href="crc_8h_source.html#l00035">crc.h:35</a></div></div>
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